diff --git a/opm/simulators/wells/SingleWellState.cpp b/opm/simulators/wells/SingleWellState.cpp
index 947cae4e2..04a44a647 100644
--- a/opm/simulators/wells/SingleWellState.cpp
+++ b/opm/simulators/wells/SingleWellState.cpp
@@ -58,6 +58,7 @@ SingleWellState::SingleWellState(const std::string& name_,
 SingleWellState SingleWellState::serializationTestObject(const ParallelWellInfo& pinfo)
 {
     SingleWellState result("testing", pinfo, true, 1.0, {}, PhaseUsage{}, 2.0);
+    result.perf_data = PerfData::serializationTestObject();
 
     return result;
 }
diff --git a/opm/simulators/wells/SingleWellState.hpp b/opm/simulators/wells/SingleWellState.hpp
index 3790f7c8b..7978b978c 100644
--- a/opm/simulators/wells/SingleWellState.hpp
+++ b/opm/simulators/wells/SingleWellState.hpp
@@ -71,6 +71,7 @@ public:
         serializer(events);
         serializer(injection_cmode);
         serializer(production_cmode);
+        serializer(perf_data);
     }
 
     bool operator==(const SingleWellState&) const;